Andersen's syndrome: A distinct periodic paralysis

V. Sansone, R. C. Griggs, G. Meola, L. J. Ptáček, R. Barohn, S. Lannaccone, W. Bryan, N. Baker, S. J. Janas, W. Scott, D. Ririe, R. Tawil

Research output: Contribution to journalArticlepeer-review


A previous study of 4 patients defined Andersen's syndrome (AS) as a triad of potassium-sensitive periodic paralysis, ventricular dysrhythmias, and dysmorphic features. AS appears to be distinct in terms of its genetic defect from the α-subunit of skeletal muscle sodium channel and the cardiac potassium channel responsible for most long QT syndromes (LQT1). We studied 11 additional patients with AS from 5 kindreds. Spontaneous attacks of paralysis were associated with hypokalemia, normokalemia, or hyperkalemia. All 11 patients had similar dysmorphic features. The QT interval was prolonged in all patients although only 4 were symptomatic. Genetic linkage studies excluded linkage to the α-subunit of the skeletal muscle sodium channel and to four distinct LQT loci. In addition, none of the common dihydropyridine receptor mutations responsible for hypokalemic periodic paralysis were present. We conclude that (1) AS is a genetically unique channelopathy affecting both cardiac and skeletal membrane excitability, (2) attacks of paralysis may be either hypokalemic or hyperkalemic, (3) a prolonged QT interval is an integral feature of this syndrome, and (4) a prolonged QT interval may be the only sign in an individual from an otherwise typical AS kindred. This may be confused with more common, potentially lethal LQT syndromes.

Original languageEnglish
Pages (from-to)305-312
Number of pages8
JournalAnnals of Neurology
Issue number3
Publication statusPublished - Sep 1997

ASJC Scopus subject areas

  • Neuroscience(all)


Dive into the research topics of 'Andersen's syndrome: A distinct periodic paralysis'. Together they form a unique fingerprint.

Cite this